Magnetic head for recording and reproduction

Abstract

There is provided a magnetic head used for both magnetic recording and reproduction thereof, comprising a magnetic head body with a gap portion, wherein a first material having a larger saturated magnetic flux density than that of said body is applied to one or both sides of said gap portion, said gap being internally provided with a second material having a smaller saturated magnetic flux density than said body.

What is claimed is: 
     
       1. A magnetic head used for both magnetic recording and reproduction thereof, comprising a magnetic head body with a gap portion, wherein the portion of said body on one side of said gap is a trailing edge side and the portion of the body on the other side of said gap is a front edge side, both edges being defined with reference to the running direction of a medium in proximity to said head, and wherein said gap has an internal portion with two substantially opposed sides, one internal side being on said trailing edge side and one internal side being on said front edge side, and wherein a first material having a larger saturated magnetic flux density than that of said body is applied to one or both sides of said gap portion, at least one of said sides of said internal portion said gap being provided with a second material having a smaller saturated magnetic flux density than said body. 
     
     
       2. The magnetic head according to claim 1 wherein said first material is applied to the trailing edge internal side, and said second material is applied to the front edge internal side. 
     
     
       3. The magnetic head according to claim 2 wherein said second material has a thickness equal to the difference between the optimum length of gap when used for reproduction and the optimum length of gap when used for recording. 
     
     
       4. The magnetic head according to claim 2 wherein said body is formed of ferrite, said first material is a metal series material, and said second material is garnet. 
     
     
       5. The magnetic head according to claim 2 wherein said body is formed of iron-nickel alloy, said first material is iron, iron-aluminum alloy or iron-cobalt alloy and said second material is ferrite or garnet. 
     
     
       6. The magnetic head according to claim 2 wherein said first material is applied to the trailing edge side and said second material is applied to both sides of said internal portion. 
     
     
       7. The magnetic head according to claim 6 wherein said second material has a thickness equal to the difference between the optimum length of gap when used for reproduction and the optimum length of gap when used for recording. 
     
     
       8. The magnetic head according to claim 6 wherein said body is formed of ferrite, said first material is a metal series material, and said second material is garnet. 
     
     
       9. The magnetic head according to claim 6 wherein said body is formed of iron-nickel alloy, said first material is iron, iron-aluminum alloy or iron-cobalt alloy and said second material is ferrite or garnet. 
     
     
       10. The magnetic head according to claim 2 wherein said first material is applied to both trailing and front edge sides and said second material is applied to the front edge internal side. 
     
     
       11. The magnetic head according to claim 10 wherein said second material has a thickness equal to the difference between the optimum length of gap when used for reproduction and the optimum length of gap when used for recording. 
     
     
       12. The magnetic head according to claim 10 wherein said body is formed of ferrite, said first material is a metal series material, and said second material is garnet. 
     
     
       13. The magnetic head according to claim 10 wherein said body is formed of iron-nickel alloy, said first material is iron, iron-aluminum alloy or iron-cobalt alloy and said second material is ferrite or garnet. 
     
     
       14. The magnetic head according to claim 1 wherein said second material has a thickness equal to the difference between the optimum length of gap when used for reproduction and the optimum length of gap when used for recording. 
     
     
       15. The magnetic head according to claim 1 wherein said body is formed of ferrite, said first material is a metal series material, and said second material is garnet. 
     
     
       16. The magnetic head according to claim 1 wherein said body is formed of iron-nickel alloy, said first material is iron, iron-aluminum alloy or iron-cobalt alloy, and said second material is ferrite or garnet.